Hardcoded CSR address in `DUMP` macro is error-prone

[colluca]

When adding custom CSRs, it is very likely to forget to adapt this. We should probably allocate one or a few dump CSRs at fixed addresses, rather than using all unmapped CSRs as dump CSRs.

snitch_cluster/sw/snRuntime/src/dump.h

Line 27 in b60f557

#define DUMP(val) ({ asm volatile("csrw 0x7C3, %0" ::"rK"(val)); })